Psalm 101 is a perfect example of a Suzerain vow. Is it attainable- Could David or any mere human fulfill the vows made in this Psalm- David must make these vows because they are the vows of king. They are a shadow, a type of the Greater David, Jesus Christ. Christ is the King under His Father and He makes these vows before His Father. He will keep them perfectly, faithfully. He, as our King, destroys all evil and keeps the world, the flesh and the devil from breaching the kingdom walls and destroying us.